Valve seat guage



Nov. 10, 1970 D. E. NOWELL 3,538,611

VALVE SEAT GUAGE Filed Aug. 5, 1968 INVENTOR 1707102021. Nowell,

ATTORNEY 3,538,611 VALVE SEAT GUAGE Donald E. Nowell, 17428 Chatsworth St, Granada Hills, Calif. 91344 Filed Aug. 5, 1968, Ser. No. 750,213 Int. Cl. G01b 3/30 US. Cl. 33-180 Claims ABSTRACT OF THE DISCLOSURE A valve seat guage and scriber tool comprising an elongate handle having a pivot receiving aperture in an end thereof, an internally threaded open ended tube means consisting essentially of a welded joint for mounting said tube intermediate its ends tangentially on said handle and extending diagonally thereof in spaced relation to the pivot receiving end thereof, an elongate stylus extending longitudinally through said tube in screw engagement therewith having a scribing point protruding in inclined relation to the pivot receiving end of said handle; said stylus being adjustable longitudinally of said tube to vary the distance between said point and the axis of said handle.

The invention is an improvement in valve seat guages of the type set forth in expired United States Pat. No. 2,557,840, issued June 19, 1951, embodying a pilot or guide rod mounted in the valve stem guide of an engine block on which rod is revolubly mounted a guage for determining inaccuracies in the valve seat; the invention in this instance residing in the provision of an adjustable scribing element or stylus for scribing a line along or adjacent the upper margin of the valve seat on rotation of the guage which line will serve as a guide in a subsequent operation of a valve grinding tool whereby accurate concentricity of the finished seat will be insured as well as conformity to the valve.

The primary object of the invention is to provide a scribing tool whereby irregularities in the surface of the valve seat of an internal combustion engine may be indicated to thereby facilitate regrinding the seat to effect removal of such irregularities and thereby insure proper seating of the engine valve.

The invention is illustrated in the accompanying drawing in which:

FIG. 1 is a view in elevation of the valve seat scribing tool;

FIG. 2 is a view in cross section and plan as seen on the line 2-2 of 'FIG. 1;

FIG. 3 is a view in section and elevation taken on the line 33 of FIG. 2 with portions broken away, showing the tool as applied in guaging an engine valve seat;

FIG. 4 is a view in side elevation showing a modification of the invention;

FIG. 5 is an elevational view as seen in the direction of the arrow 5 in FIG. 4;

FIG. 6 is a plan view partly in section as seen on the line 6-6 of FIG. 4; and

FIG. 7 is an enlarged detail in section taken on the line 7-7 of FIG. 6.

Referring to the drawings more specifically A indicates an elongate handle having a cylindrical end aperture s for slidable telescopic reception of the upper end of an upstanding cylindrical pivot pin 9 temporarily mounted in the open upper end of a vertically extending tubular valve stem guide 10 of an engine valve assemblage, the annular seat 11 of which valve is to be re' ground to compensate for wear; the engine valve and its stem being removed from the guide 10 for such purpose.

Mounted on the side of the handle A intermediate its United States Patent 0 3,538,611 Patented Nov. 10, 1970 "ice ends and extending diagonally thereof is an internally threaded elongate open ended tube 12 and extending longitudinally through the tube and projecting from the opposed ends thereof is a threaded stylus 13 having srcew engagement with the threads of the tube 12 for longitudinal adjustment relative to the latter.

The terminus of the stylus 13 protruding from the lower end of the tube 12 is provided with a scribing point 14 adapted to be positioned to contact raised portions of the outer margin of the valve seat 11 in scribing engagement therewith on rotation of the handle A.

The stylus is threaded throughout its length and has screw engagement with internal threads 15 on the tube 12 whereby longitudinal adjustment of the stylus relative to the tube may be effected by rotating the stylus which operation may be effected by means of a screwdriver engaged with a kerf 16 on the outer end of the stylus.

In the construction shown in FIGS. 1, 2 and 3, the tube 12 is rigidly affixed to the handle A by a weld joint 17 whereby the angle of incidence of the scribing point 14 and the surface of the valve seat 11 will be the same irrespective of the extent of protrusion of the stylus from the tube 12 and handle A. However, in some instances it may be desirable to pivotally mount the tube 12 intermediate its ends with the stylus 12 therein on the handle A so that this angle of incidence of the stylus point may be varied, in which event the construction shown in FIGS. 4-7 may be employed. This construction embodies a circular disk 18 rigidly mounted centrally thereof on the tube 12 intermediate its ends by a weld joint 18 which disk is turnably mounted face-to-face on a similar disk 19 rigidly mounted on the side of the handle A intermediate its ends by a weld joint 20, as shown in FIG. 7.

The pivotal mounting of the disk 18 on the disk 19 comprises a pair of opposed arcuate slots 2122 in the disk 18 and headed screws 2323 extending through said slots and engaged with the disk 19. On loosening the screws 23-24, the disk 18 may be turned circumferentially a partial revolution to thereby vary the angular relation of the tube 12 and stylus 13 relative to the handle A.

As a means of fastening the stylus 13 against turning relative to the tube 12, a lock-nut 25 is screwed on the stylus into abutting relation to an end of the tube 12.

In the operation of the invention, the engine valve is removed from its tubular guide 10 and the guide pin 9 inserted in the latter in place thereof as shown in FIG. 3. The handle A is then positioned in turnable engagement with the upper end of the pin 9 as shown in FIG. 3 and the stylus 13 is adjusted longitudinally in its threaded engagement with the tube 12 so that the pointed tip 14 of the stylus will abut the surface of the inner margin of the valve seat B as shown in FIG. 3. On then rotating the handle A the point 14 of the stylus while in contact with the valve surface will delineate a curved or arcuate line on the surface of the valve seat. This line will be concentric with the axis of the seat, and will be equally spaced throughout from such axis except where portions of the valve seat are worn out of round, in which event portions of the valve seat will be spaced a greater distance from the axis of the valve, and in which event the usual regrinding tool on removal of the handle A from the guide pin 9.

Manifestly the gauge may be utilized in testing a valve regrinding operation.

I claim:

1. A valve seat guage and scriber tool comprising:

(a) an elongate handle having a pivot receiving means in one end thereof,

(b) an elongate stylus,

(c) means consisting essentially of a welded joint supporting said stylus tangentially on said handle in diagonal relation thereto, and

(d) a scribing element on said stylus protruding in inclined relation to the pivot receiving end of said handle.

2. The structure called for in claim 1 wherein said stylus is threaded and has screw engagement with said supporting means for longitudinal adjustment thereon.

3. A valve seat guage and scriber tool comprising an elongate handle having a pivot receiving aperture in an end thereof, an internally threaded open ended tube means consisting essentially of a welded joint for mounting said tube intermediate its ends tangentially on said handle and extending diagonally thereof in spaced relation to the pivot receiving end thereof, an elongate stylus extending longitudinally through said tube in screw engagement therewith having a scribing point protruding in inclined relation to the pivot receiving end of said handle; said stylus being adjustable longitudinally of said handle; said stylus being adjustable longitudinally References Cited UNITED STATES PATENTS 565,579 8/1896 Topping. 1,876,280 9/1932 Dunn. 1,891,364 12/1932 Albertson et al. 2,354,539 7/1944 Passick et al. 2,915,829 12/ 1959 Baxter.

FOREIGN PATENTS 949,497 2/1949 France.

WILLIAM D. MARTIN, JR., Primary Examiner U.S. Cl. X.R. 33 27, 169 

